Problem 4. Access Control (30 pt., 10 pt. each) Assume the followings: Privileges: read (R), write (W), execute (X) Resources: - Image files: tamuc.jpg, jkim.png, csci351.gif - Document files: syllabus.doc, lecture.ppt - Binary files: a.exe, b.exe, c.exe Access permissions: - A has privilege to read all the image files B has privilege to read and write all the document files (i.e., syllabus.doc and lecture.ppt) A and C have privilege to read syllabus.doc - A and B have privilege to read and execute "a.exe", "b.exe". - B and C have privilege to read tamuc.jpg. a. Construct an access control matrix. b. Construct an access control list. c. Construct capabilities. Problem 4. Access Control (30 pt., 10 pt. each) Assume the followings: Privileges: read (R), write (W), execute (X) Resources: - Image files: tamuc.jpg, jkim.png, csci351.gif - Document files: syllabus.doc, lecture.ppt - Binary files: a.exe, b.exe, c.exe Access permissions: - A has privilege to read all the image files B has privilege to read and write all the document files (i.e., syllabus.doc and lecture.ppt) A and C have privilege to read syllabus.doc - A and B have privilege to read and execute "a.exe", "b.exe". - B and C have privilege to read tamuc.jpg. a. Construct an access control matrix. b. Construct an access control list. c. Construct capabilities